Memory Game The Endocrine SystemOnline version Review the organs of the endocrine system and their functions. by Kathy Dilliplane Pituitary Testes Pineal Gland Produces melatonin to regulate sleep cycles Adrenal Glands Thyroid Pancreas Regulates the female reproductive system Increase heart rate during a "Fight or Flight" response Parathyroid Glands Regulates blood sugar levels The body's "Master Gland" that controls the other endocrine organs. Thymus Regulate the male reproductive system Ovaries Regulates growth and metabolism Regulates calcium levels in the blood. Helps the immune system recognize and fight pathogens